This paper studies order admission strategy for a Make to Order ( MTO) production system with ran-dom arriving orders． Our method includes two steps． In the first step，the Technique for Order Preference by Similarity to an Ideal Solution ( TOPSIS) is adopted to calculate the degree of closeness between new orders and ideal orders which will be regarded as the comprehensive income of the orders，which is used to further prioritize the new order． In the second step，whether to accept the new order or not is analyzed through Markov Decision Process ( MDP) model． The result shows that when demand is close to or more than capacity，order hierarchy can increase benefits but not when the demand is largely less than the capacity． The income by strati-fying orders will increase with the demand，decrease with the capacity，and has an inverted U-shaped relation-ship with production lead time． The numerical result shows that the income is higher with more exquisite order hierarchy． When the hierarchy number is closer to the number of production lines，the income is closer to the maximum．